X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=drivers%2Fusb%2Fhost%2Fuhci-hub.c;h=8e4427aebb142e00d79b83e4624697b8d746ce33;hb=97bf2856c6014879bd04983a3e9dfcdac1e7fe85;hp=152971d167695580bc69282091888cc1b962ea90;hpb=76828883507a47dae78837ab5dec5a5b4513c667;p=linux-2.6.git

diff --git a/drivers/usb/host/uhci-hub.c b/drivers/usb/host/uhci-hub.c
index 152971d16..8e4427aeb 100644
--- a/drivers/usb/host/uhci-hub.c
+++ b/drivers/usb/host/uhci-hub.c
@@ -33,6 +33,9 @@ static __u8 root_hub_hub_des[] =
 /* status change bits:  nonzero writes will clear */
 #define RWC_BITS	(USBPORTSC_OCC | USBPORTSC_PEC | USBPORTSC_CSC)
 
+/* suspend/resume bits: port suspended or port resuming */
+#define SUSPEND_BITS	(USBPORTSC_SUSP | USBPORTSC_RD)
+
 /* A port that either is connected or has a changed-bit set will prevent
  * us from AUTO_STOPPING.
  */
@@ -52,10 +55,20 @@ static int any_ports_active(struct uhci_hcd *uhci)
 static inline int get_hub_status_data(struct uhci_hcd *uhci, char *buf)
 {
 	int port;
+	int mask = RWC_BITS;
+
+	/* Some boards (both VIA and Intel apparently) report bogus
+	 * overcurrent indications, causing massive log spam unless
+	 * we completely ignore them.  This doesn't seem to be a problem
+	 * with the chipset so much as with the way it is connected on
+	 * the motherboard; if the overcurrent input is left to float
+	 * then it may constantly register false positives. */
+	if (ignore_oc)
+		mask &= ~USBPORTSC_OCC;
 
 	*buf = 0;
 	for (port = 0; port < uhci->rh_numports; ++port) {
-		if ((inw(uhci->io_addr + USBPORTSC1 + port * 2) & RWC_BITS) ||
+		if ((inw(uhci->io_addr + USBPORTSC1 + port * 2) & mask) ||
 				test_bit(port, &uhci->port_c_suspend))
 			*buf |= (1 << (port + 1));
 	}
@@ -84,19 +97,25 @@ static void uhci_finish_suspend(struct uhci_hcd *uhci, int port,
 		unsigned long port_addr)
 {
 	int status;
+	int i;
 
-	if (test_bit(port, &uhci->suspended_ports)) {
-		CLR_RH_PORTSTAT(USBPORTSC_SUSP | USBPORTSC_RD);
-		clear_bit(port, &uhci->suspended_ports);
-		clear_bit(port, &uhci->resuming_ports);
-		set_bit(port, &uhci->port_c_suspend);
+	if (inw(port_addr) & SUSPEND_BITS) {
+		CLR_RH_PORTSTAT(SUSPEND_BITS);
+		if (test_bit(port, &uhci->resuming_ports))
+			set_bit(port, &uhci->port_c_suspend);
 
 		/* The controller won't actually turn off the RD bit until
 		 * it has had a chance to send a low-speed EOP sequence,
-		 * which takes 3 bit times (= 2 microseconds).  We'll delay
-		 * slightly longer for good luck. */
-		udelay(4);
+		 * which is supposed to take 3 bit times (= 2 microseconds).
+		 * Experiments show that some controllers take longer, so
+		 * we'll poll for completion. */
+		for (i = 0; i < 10; ++i) {
+			if (!(inw(port_addr) & SUSPEND_BITS))
+				break;
+			udelay(1);
+		}
 	}
+	clear_bit(port, &uhci->resuming_ports);
 }
 
 /* Wait for the UHCI controller in HP's iLO2 server management chip.
@@ -170,10 +189,9 @@ static int uhci_hub_status_data(struct usb_hcd *hcd, char *buf)
 
 	spin_lock_irqsave(&uhci->lock, flags);
 
-	uhci_scan_schedule(uhci, NULL);
-	if (uhci->hc_inaccessible)
+	uhci_scan_schedule(uhci);
+	if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) || uhci->dead)
 		goto done;
-	check_fsbr(uhci);
 	uhci_check_ports(uhci);
 
 	status = get_hub_status_data(uhci, buf);
@@ -228,7 +246,7 @@ static int uhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 	u16 wPortChange, wPortStatus;
 	unsigned long flags;
 
-	if (uhci->hc_inaccessible)
+	if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags) || uhci->dead)
 		return -ETIMEDOUT;
 
 	spin_lock_irqsave(&uhci->lock, flags);
@@ -258,15 +276,13 @@ static int uhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 			wPortChange |= USB_PORT_STAT_C_CONNECTION;
 		if (status & USBPORTSC_PEC)
 			wPortChange |= USB_PORT_STAT_C_ENABLE;
-		if (status & USBPORTSC_OCC)
+		if ((status & USBPORTSC_OCC) && !ignore_oc)
 			wPortChange |= USB_PORT_STAT_C_OVERCURRENT;
 
 		if (test_bit(port, &uhci->port_c_suspend)) {
 			wPortChange |= USB_PORT_STAT_C_SUSPEND;
 			lstatus |= 1;
 		}
-		if (test_bit(port, &uhci->suspended_ports))
-			lstatus |= 2;
 		if (test_bit(port, &uhci->resuming_ports))
 			lstatus |= 4;
 
@@ -276,7 +292,7 @@ static int uhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 			wPortStatus |= USB_PORT_STAT_CONNECTION;
 		if (status & USBPORTSC_PE) {
 			wPortStatus |= USB_PORT_STAT_ENABLE;
-			if (status & (USBPORTSC_SUSP | USBPORTSC_RD))
+			if (status & SUSPEND_BITS)
 				wPortStatus |= USB_PORT_STAT_SUSPEND;
 		}
 		if (status & USBPORTSC_OC)
@@ -309,7 +325,6 @@ static int uhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 
 		switch (wValue) {
 		case USB_PORT_FEAT_SUSPEND:
-			set_bit(port, &uhci->suspended_ports);
 			SET_RH_PORTSTAT(USBPORTSC_SUSP);
 			OK(0);
 		case USB_PORT_FEAT_RESET:
@@ -343,8 +358,11 @@ static int uhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
 			CLR_RH_PORTSTAT(USBPORTSC_PEC);
 			OK(0);
 		case USB_PORT_FEAT_SUSPEND:
-			if (test_bit(port, &uhci->suspended_ports) &&
-					!test_and_set_bit(port,
+			if (!(inw(port_addr) & USBPORTSC_SUSP)) {
+
+				/* Make certain the port isn't suspended */
+				uhci_finish_suspend(uhci, port, port_addr);
+			} else if (!test_and_set_bit(port,
 						&uhci->resuming_ports)) {
 				SET_RH_PORTSTAT(USBPORTSC_RD);